Monk Parakeet’s (Myiopsitta monachus) Ecological Parameters after Five Decades of Invasion in Santiago Metropolis, Chile

Q4 Agricultural and Biological Sciences Western Birds Pub Date : 2022-10-09 DOI:10.3390/birds3040023
Cristóbal Briceño, Matilde Larraechea, S. Alvarado
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引用次数: 2

Abstract

Monk Parakeets are considered one of the most invasive bird species given its unique capacity among psittacines to build their own communal nests. Originally introduced as pets in houses from where they escaped or were released, they are currently considered invasive in more than 20 countries worldwide. This is the case in Chile, where Monk Parakeets were introduced during the 1970s. Between 2016 and 2019 we searched Monk Parakeets’ nests structures in the Santiago metropolis region. We identified 1458 Monk Parakeets’ communal nests on 546 trees belonging to 34 tree species. Ninety-one percent of the occupied trees were also introduced. Paraná pine and cedar of Lebanon were the tree species with highest abundance of nests, averaging more than four nests/tree/species, with 23 and 18 maximum number of nests, respectively. Tasmanian blue gum and black locust were selected by parakeets more often than expected, based on availability. From all trees, 24.6% denoted health problems and 47.3% were pruned. The average nest height was 14.2 m and nests were observed mainly in secondary branches (59.3%). The occupancy rate was 89.7% and was associated to nest height and type of branch. During two reproductive seasons we quantified eggs and nestlings in chambers averaging 4.5 and 4.2, respectively. We provide a rough population size estimate and the characteristics of Monk Parakeets nest and tree selectivity, aiming to characterize several decades of a neglected urban invasion to warrant strategies for improved management measures.
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智利圣地亚哥五十年入侵后僧侣长尾小鹦鹉的生态参数
和尚长尾小鹦鹉被认为是最具入侵性的鸟类之一,因为它在鹦鹉群中具有独特的筑巢能力。它们最初是作为宠物被引入家中,从那里逃脱或被释放,目前在全球20多个国家被视为入侵物种。智利就是这种情况,20世纪70年代在那里引入了僧侣长尾小鹦鹉。在2016年至2019年期间,我们在圣地亚哥大都市地区搜索了僧侣长尾小鹦鹉的巢穴结构。我们在34个树种的546棵树上发现了1458个和尚长尾小鹦鹉的公共巢穴。91%的被占用树木也被引进。黎巴嫩副松树和雪松的巢数最多,平均每树/种有4个以上的巢,最大巢数分别为23个和18个。根据可用性,长尾小鹦鹉选择塔斯马尼亚蓝胶和刺槐的频率高于预期。在所有树木中,24.6%表示健康问题,47.3%被修剪。平均巢高14.2 m,以次生枝为主,占59.3%;入住率为89.7%,与巢高和枝型有关。在两个繁殖季节,我们分别在平均4.5和4.2的巢室中量化蛋和雏鸟。我们提供了一个粗略的种群规模估计和僧侣长尾小鹦鹉筑巢和树木选择的特征,旨在描述几十年来被忽视的城市入侵,以保证改进管理措施的策略。
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Western Birds
Western Birds Agricultural and Biological Sciences-Animal Science and Zoology
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0.60
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